Typewriter-spacing mechanism



May 12, 1925. 1,537,503

B. $HATZ TYPEWRITER SPACING MECHANISM Filed Jan. 29, 1925 Patented May 12, 1925 UNITED STATES 1,537,503 PATENT OFFICE.

BARNETT SHATZ, OF BUENOS AIRES, ARGENTINA, ASESEGNOR TO UNDERWQOJ J WRITER COMPANY, OF NEVI YORK, 11'. Y., A CORPORATION OF DELAWARE.

TYPEWR-ITER-SEACING- MECHANISM.

Application filed. January 29, 1923. Serial No. 615,688.

T all whom it may concern:

Be 1t known that I, BARNETT SHATZ, a citizen of the United States, residing at Buenos .Aires, Argentine Republic, have invented certain new and useful Improvements in Typewriter-Spacing Mechanism, of'which the following is a specification. This invention relates to improvements in line-spacing mechanism for typewriters and more particularly to improvements in the type of line-spacing mechanism disclosed in my Patent No. 1422892, July 18, 1922. p

The primary object of the invention is to furnish a spacing-mechanism capable of very minute adjustments so that the mechanism may be arranged to accommodate variously spaced lines onlined or ruled paper, and which will also permit the typewriter platen roll to be readily shifted to the proper position for correcting the matter in a typewritten line. i

A further object of the invention is to provide a spacing-mechanism including. friction contact elements adapted to positively and instantaneously move the platen roll when the roll operating member is actuated.

Another object is to provide improved mechanism for locking the adjustable stop of the shifting mechanism in various positions. I

A still further object is to provide a novel resilient washer locked in position and functioning to hold the platen shaft operating disk in a fixed position relatively to the pawls or cams with which it cooperates.

lVith the foregoing objects outlined and with other objects in view .which will appear as the description proceeds, the invention consists in the novel featuresdescribed in detail, illustrated in the accompanying drawing and more particularly pointed out in the appended claims.

Referring to the drawing:

Figure 1 is an end view of a'portion of a typewriter carriage with my improvements implied-thereto. V 7

Fig.2 is avertical sectional View of certain of the details. I

Fig. 8 is a top plan view of the parts shown in Fig. 1. I

Fig. 4; is an end view partly in section of the resilient washer. employed for forcing the friction disk and platen shaft in a certain direction.

In the drawing, 1 designates a bell crank lever pivot-ally mounted on the shaft 2 of. the platen roll of the machine and provided with a pointer at its upper end cooperatmg with a graduated scale 22 arranged horiposition by means of a spring 6 having its lower end connected to the arm 1 of the b'ell crank lever and its upper end secured at 6 to the end plate 23' of the carriage frame. This spring draws'the arm 1 of the bell crank lever upwardly and causes the shelf 1' of said arm to abut against the lower end of the stop screw 9. This stop screw extends through a split stationary nut 7, which is Socured to the end plate 23 by means of the screw 8. The stop screw 9 has a head 10 adapted to be engaged by the operator for adjusting said screw. The split portion of the nut 7 is provided with a thumb-screw'll adapted to contract said split nut for lock ing thescrew 9 in position. 'The end plate 23 is provided with a depending lug 13 which is apertured t0 form a bearing for the sliding bar 12, which is provided at its forward end with an angular portion 15 adapted to be depressed by the operator for causing actuation of the mechanism. A bearing-lug 14 also slidably supports said bar 12.

The bar 12 is moved forwardly by a spring 16 which has one of its ends fixed to a screw 17 on the end plate 23 and its other end 86-. cured at 18 to the rear end of the bar 1 2. A screw16 limits the forward'movement of the bar 12. i ,v The sliding bar 12 is provided with a pin 19 adapted when the sliding is moved rearwardly to strike the abutment surface w and cause the cam pawl 5' to swing about its axis 4. This causes the periphery of the cam to frictionally lock with the disk 21 which is keyed to the shaft 2 at 21 When the cam 5 looks itself to the disk 21, said disk will turn in a counter-clockwise direction with the bell crank lever 1 and this movement will continue until a second cam pawl 5 mounted on the arml of the bell crank lever, strikes a stop element 5. Vhe'n this occurs the cam 5 will be also swung into a. position to lock itself against the periphery of the disk 21, and then the bell crank lever 1, pawls and 5 disk 21 and the platen shaft 2. will all move'together. The provision of two cams. at substantially opposite sides of said disk 21 insures positive locking between the bell crank lever and the disk 21 so that there w ll be no slippage liable to cause inaccura- In order to force the disk 21 toward the left so that it will occupy a position to be engaged by the pa'wls, I have provided a resilient cross-shaped washer 23 which is mounted on the shaft 2 and bears at one side against a washer 12a andat its other side againstrthe disk 21. One arm of said washer is elongated and provided with an aperture, as shown in Figure 4-, to receive a pin 251which is fixed to the end plate 23.

ened and the screw lO is adjusted. screw 9 is moved 'downwardly its end will u rockthe bell crank lever in a counter-clock-- wi se direction and the'pointer 3 'may be This prevents the washer from rotating with the disk2l,

V In-operation, the thumb-screw 11 is loosbrought to a proper' position relatively to the marks on the'scal'e-QQ. "If the screw 10 is'ii'noved upwardly, the" spring 6 will "cause thevbellcrank lever to move in a clockwise directionand follow the screw 9. When the pointer 3 is brought to a. proper position to accord with the spacing desired, the thumb screw 11 is tightened and this Will.

cause the screw 9 to remain indefinitely in its fixed position.- Tlien the platen roll may lie-advanced step by step to accord with the spacing desired, by depressing the operating bar 12 to move the same toward the I left or rearwardly. Astlie bar moves reari wai'dly itspin19 causes the pawl 5 toswing in a counter-clockwise direction and look "on, the disk 21.

lontiiiued rearward move- 'un ent ofthe bar 12- causes the cam 5, bell the operator until the platen roll has been [advanced the desired amount, and then the crank lever 1 and diskQl to movetogether 5 engages the stop 5, and

until the pawl V V i 5 will lock on the diskand then said pawl also move with the same. The movement of the bar 12will'be continued rearwardly by v bar112is released and the spring 16 will automatically return the'sanie' to its initial position, while the spring ti will return the bell cranklever and its connected parts to normal position. 'A spring'20 is provided for hOlCllIlfl the cam 5 normally in a position Y where it will'not interfere with the rotation j mechanism.

of the disk 21 independently of the bell crank lever, so that said platen shaft may be actuated without disturbing the line-spacing Prior to the present invention it has been proposed to provide the platenshaft with a ratchet wheel having fine teeth adapted to be engagedby pawls',but it has been found If the by actual practice that the spaces betweeii such teeth become clogged and after short use vthe spacing-1necl1anis1n becomes inaccurate. V r

From the foregoing-it is believed that the construction, operation and advantages of the invention, may be readily understood and it is apparent that various changes may be made in the details disclosed without dedesire to secure by 2. In a typewriting machine, a'platen shaft, a disk fixed to'said shaft, a lever movable about the axis of said shaft, a cam pawl carried bysaid leverjan operating member e igaigeable with said cam pawl for swinging-the'latter about its axis and-cans 'ing the same to lock on said disk, and a second cam pawl pivoted to sa'idlever and also:

engaging said disk to lock the lever thereto.

3. In a typewriting machine, a platen shaft, a disk fixed to saidshaft, a lever pivotally mounted onv said shaft, a cam pawl carried iby said lever and adapted when swung'inone direction to lock on said'disk, an operating member adapted to swing the cam'in its lock ng direction and then cause the cam and lever to swing about the axis of said shaft, a second cam pawl pivoted to said'lever and also engaging said disk to lock the lever thereto, and means for returnc inn said lever to its initial position.

4. In a t-ypewritingmachine, the combination with a platen shaft, of a friction disk fixed to said sh aft, a lever pivotally mounted on said shaft, a cam pawl pivotally mounted on the lever and adapted when moved in one direction to lock itself tothedisk, an operating member for swinging; said'cam into its locking position and for then causing thepawl and lever to move said disk, a second cam pawl pivoted to said lever and also engaging said disk to lock the lever thereto,

and a spring for returning said lever to its initial position,

5QIn a type'writingmachine, a platen,

shaft, a disk fixed to said shaft, a lever pivotally mounted on said shaft, a locking member arranged on said lever and adapted to lock itself to said disk, an operating me n-V her for moving said lever in one direction,

a'stop screw for adjusting said'lever, a split stationary nut engaging said screw, and a second screw adapted to contract said Split nut for locking the first mentioned screw in adjusted positions.

6. A typewriting machine as claimed in claim 1 including a resilient washer mounted on the shaft and engaging the disk for yieldingly forcing the same in one direction, and means for locking said washer in position to prevent the same from turning with said nisk.

7. In a typewriting machine, a carriage end plate, a platen shaft extending through said end plate, a disk fixed to said shaft and provided with a smooth periphery a double armed lever pivotally mounted on said shaft 15 and provided with a plurality of pivotally mounted cam pawls adapted when swung in certain directions to look themselves to said disk, a slidable-operatlng bar provlded with a pin adapted to engage one of said 0am pawls for swinging the same into locking position, a fixed stop member adapted to engage the other pawl for swinging the same into locked position, a spring engaging one arm of said lever and functioning to swing the lever in one direction, and an adjustable stop engageahle with said lever for limiting its movement in one direction.

Intestimony whereof I hereunto afiix my signature.

BARNETT SHATZ. 

